Spa



FIG. 1 is a perspective view of a spa showing my new design;

FIG. 2 is another perspective view thereof, taken from a different angle;

FIG. 3 is a plan view thereof;

FIG. 4 is a cross-sectional view thereof, taken along line 4--4 of FIG. 3;

FIG. 5 is a cross-sectional view thereof, taken along line 5--5 of FIG. 3; and

FIG. 6 is an enlarged, fragmentary perspective view of the skimmer of my new design shown separately for clarity of illustration. 

The ornamental design for a spa, as shown and described. 